On the Local Time Variation of Atmospheric-Ionospheric Disturbances

Proelss, G. W.; Zahn, U. von

doi:10.1016/b978-0-08-022021-5.50036-7

Cited by 119 publications

(214 citation statements)

References 9 publications

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“…Moreover, the height increases are common features of the ionospheric behaviour during events of either ionisation decreases or increases at night. This is in confirmation of the storm scenario proposed by Prölss (1993) in which changes in layer height are predicted for any local time. An additional feature that supports the idea that a new source of ionisation is responsible for the observed nighttime ionisation enhancements is the very good correlation between the ITEC deviations from their quiet values and the foF2 deviations.…”

Section: Discussionsupporting

confidence: 71%

“…Assuming then that they propagate from auroral latitudes to middle latitudes, such as TID disturbances, and that the time delay is related to their propagation velocity, the above statement also holds true for the propagation velocities' behaviour and may be an explanation for the large range of velocities that have been reported. TID consideration could justify a possible explanation for ionisation enhancements (Prölss, 1993;Miller, 1997), although the lack of ionisation in the night-side hemisphere does not support any traditional scenario in ionisation enhancements attribution. Indeed, no consistent relation between the F2 peak density and height variations were found, so it follows that the variations in the two ionospheric parameters are attributed to two distinct mechanisms.…”

Section: Discussionmentioning

confidence: 99%

“…The Prölss (1993) phenomenological model represents one of the most popular descriptions of the ionospheric storm-induced effects, which was further extended by Fuller-Rowell et al (1994;, although in this model only daytime positive storm effects are…”

Section: Introductionmentioning

confidence: 99%

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On the nature of nighttime ionisation enhancements observed with the Athens Digisonde

Tsagouri

Belehaki

2002

Ann. Geophys.

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Abstract. True height electron density profiles observed with the Athens Digisonde were analyzed together with geomagnetic data indices for six magnetic storms in September and October 2000 in an effort to define the ionospheric structure during events of nighttime ionisation enhancements and to discuss the physical processes that may cause them. An upwelling of the F2-layer, limited to the dark hemisphere, was evident in all storm events as the ionospheric response to enhanced geomagnetic activity, but nighttime positive effects and nighttime height enhancements are attributed to two distinct mechanisms, according to our findings. Height enhancements are wave-like disturbances and the time delay of their occurrence at middle latitudes depends on the increase rate of the AE index, and consequently, on the rate that the solar wind input energy dissipates in the auroral ionosphere. Thus, they most probably originated in the auroral oval region and propagated toward the equator-like TID disturbances, with a periodicity that depends on the ionisation density. On the other hand, foF2 increases do not share the same wavy appearance, which could mean that they are not connected to TIDs and are not of auroral oval origin. The increased nighttime density can only be speculated to be due to increased downward fluxes from the plasmasphere.

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Section: Discussionsupporting

confidence: 71%

Section: Discussionmentioning

confidence: 99%

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On the nature of nighttime ionisation enhancements observed with the Athens Digisonde

Tsagouri

Belehaki

2002

Ann. Geophys.

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“…Apart from the deformation of the Ne(h) profile as a whole, the equatorward wind in such TADs shifts the F2-layer to higher altitudes with a higher production/loss ratio resulting in an NmF2 increase. This is a well-known mechanism of the F2-layer positive storm effect (Prölss, 1993(Prölss, , 1995Bauske and Prölss, 1997). This type of positive disturbances may be attributed to the type II (Zevakina and Kiseleva, 1978).…”

Section: Discussionmentioning

confidence: 99%

Pre-storm <I>Nm</I>F2 enhancements at middle latitudes: delusion or reality?

Mikhailov

Perrone

2009

Ann. Geophys.

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Abstract.A critical analysis of recent publications devoted to the NmF2 pre-storm enhancements is performed. There are no convincing arguments that the observed cases of NmF2 enhancements at middle and sub-auroral latitudes bear a relation to the following magnetic storms. In all cases considered the NmF2 pre-storm enhancements were due to previous geomagnetic storms, moderate auroral activity or they presented the class of positive quiet time events (Qdisturbances). Therefore, it is possible to conclude that there is no such an effect as the pre-storm NmF2 enhancement as a phenomenon inalienably related to the following magnetic storm. The observed nighttime NmF2 enhancements at subauroral latitudes may result from plasma transfer from the plasma ring area by meridional thermospheric wind. Enhanced plasmaspheric fluxes into the nighttime F2-region resulted from westward substorm-associated electric fields is another possible source of nighttime NmF2 enhancements. Daytime positive Q-disturbances occurring under very low geomagnetic activity level may be related to the dayside cusp activity.

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“…The time-dependent response to disturbed solar wind conditions is referred to as an ''ionospheric storm''. Variations in the state of the ionosphere associated with storms are primarily connected with transport by electric fields and neutral winds, changes in the neutral composition and structure, and energetic particle precipitation, and they are dependent on local time, latitude, and season (e.g., Prölss 1993). …”

Section: Swif's Concept and Implementation Plan Of The Enhanced Versionmentioning

confidence: 99%

Ionospheric forecasts for the European region for space weather applications

Tsagouri

Belehaki

2015

J. Space Weather Space Clim.

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This paper discusses recent advances in the implementation and validation of the Solar Wind driven autoregression model for Ionospheric short-term Forecast (SWIF) that is running in the European Digital upper Atmosphere Server (DIAS) to release ionospheric forecasting products for the European region. The upgraded implementation plan expands SWIF's capabilities in the high latitude ionosphere while the extensive validation tests in the two solar cycles 23 and 24 allow the comprehensive analysis of the model's performance in all terms. Focusing on disturbed conditions, the results demonstrate that SWIF's alert detection algorithm forecasts the occurrence of ionospheric storm time disturbances with probability of detection up to 98% under intense geomagnetic storm conditions and up to 63% when storms of moderate intensity are also considered. The forecasts show relative improvement over climatology of about 30% in middle-to-low and high latitudes and 40% in middle-to-high latitudes. This indicates that SWIF is able to capture on average more than one third (35%) of the storm-associated ionospheric disturbances. Regarding the accuracy, the averaged mean relative error during storm conditions usually ranges around 20% in middle-tolow and high latitudes and 24% in the middle-to-high latitudes. Our analysis shows clearly that SWIF alert criteria were designed to effectively anticipate the ionospheric storm time effects that occurred under specific interplanetary conditions, e.g., cloud Interplanetary Coronal Mass Ejections (ICMEs) and/or associated sheaths. The results provide valuable input in advancing our ability in predicting the space weather effects in the ionosphere for future developments, and further work is proposed to enhance the model forecasting efficiency to support operational applications.

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On the Local Time Variation of Atmospheric-Ionospheric Disturbances

Cited by 119 publications

References 9 publications

On the nature of nighttime ionisation enhancements observed with the Athens Digisonde

On the nature of nighttime ionisation enhancements observed with the Athens Digisonde

Pre-storm <I>Nm</I>F2 enhancements at middle latitudes: delusion or reality?

Ionospheric forecasts for the European region for space weather applications

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On the Local Time Variation of Atmospheric-Ionospheric Disturbances

Cited by 119 publications

References 9 publications

On the nature of nighttime ionisation enhancements observed with the Athens Digisonde

On the nature of nighttime ionisation enhancements observed with the Athens Digisonde

Pre-storm &lt;I&gt;Nm&lt;/I&gt;F2 enhancements at middle latitudes: delusion or reality?

Ionospheric forecasts for the European region for space weather applications

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Pre-storm <I>Nm</I>F2 enhancements at middle latitudes: delusion or reality?